The structure of the liquid crystal display is a typical three-layer structure. Like a sandwich, the liquid crystal is sandwiched between two glass substrates. The two glass substrates are TFT Array glass and color filters. There are countless pixels arranged on the TFT Array glass, and the color filter is an important source of screen color. When the voltage is on the TFT (transistor), the liquid crystal turns, and then the light passes through the liquid crystal to create a pixel on the panel, and the backlight module provides the function of a light source. At this time, the color filter gives each pixel a characteristic color. Numerous colors form the display we see.
TFT-LCD must be produced in a precision clean room after more than 300 processes. The highest cleanliness level of the clean room can reach 10 (that is, within the environment of the clean room, there is only a maximum of 10 dusts per cubic foot).
TFT-LCD manufacturing main three-stage process:
① Front Array
The Array process in the previous section is similar to the semiconductor process, except that the thin film transistor is made on glass, instead of being fabricated on a silicon wafer like a semiconductor.
② Middle Cell
The cell in the middle section is the Array glass in the previous section as the substrate, which is combined with the color filter glass substrate. The two are filled with liquid crystal and bonded together, and then the large glass is cut into a panel.
③ Rear Module Assembly
The assembly process of the rear module is the assembly and production of the glass and other components, such as circuits, frames, backlights, etc., after the Cell process.